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gni-teil tatw I HW @mm IMPROVEMENT IN NIGHT-LATGHES.

tlge Sttetule otenet tu in these tettets ntcnt mit mittag prat at tige santa.

TO ALL WHOM IT MAY, CONCERN:

Beit known that I, EDWARD W. BRETTELL, of the city of Newark, in the county of Essex, and State of New Jersey, have'invented certain new and useful Improvements in Locks for Doors, ete.; and I do hereby declare that the following is;a full and exact description thereof. The accompanying drawings form apart of this specification.

Figurel is a front view, with the plate removed to exhibit the interior, with the bolt thrownout.

Figure 2 is a horizontal view through the works' and easing with the bolt thrown back.

Figure 3 is a front view, withthe plate removedto exhibit the interior, with the bolt thrown back.

Figure 4 is a horizontal section through the cylinder, showing the sliding tumbler-s and their springs.

Figure 5 is a side view of the key, which is similar in its general form to those employed in several varieties of locks. i

Figure 6 is a front -and edge view of the frog-bridge.

Figure 7 is a front and edge view of the sliding tumblers.

Similar letters of reference indicate likeparts in all the iigures.

My invention is intended to make a lock more secure against bui-glars," and little objectionable on account of cost.

To enable others skilled in the art to make and use my invention, Iwill proceed to describe its construction and operation by the aid of the drawings and of the letters of reference marked thereon.

Fig. 1, B is the casing; A is the bolt; C is the cylinder, cut or otherwise formed with a rectangular space in its interior for the sliding tumblers o o1 o2 o3 to work in. D is a frog-bridge working on a pivot, theedge ,bearing against the sliding tumblers o o1 o2 o3. S is a spring attached to the `stop F and the bolt A for the purpose of keeping the bolt-,stop in its proper place and holding the frog-bridge in its proper place also. Fig. 2, C* is an outside cylinder riveted to the front plate of the lock for the purpose of holding the inside cylinder C and slides o o1 o2 o3 in their proper positions, with the aid of small springs'at the bottom placed between the projecting arms; better shown in iigA 4. Fis a stop for the purpose of holding the bolt back or keeping the same out, and'is of construction similar to that employed in manyother locks. yA2, as shown in fig. 2, is a thumb-piece used for drawing Athe bolt back without the use of a key. The frog-bridge D (shown in fig. 1 bearing on the dog y projecting out of the arm of the cylinder C) acts for throwing back the bolt and at the same time, when the key is inserted in slot c, iig. 2, will throw the sliding tumblers o ol 02 03 in a proper position to allow frog-bridge D to-enter (by turning the key) recesses of sliding tumblers o o1 o2 o3, shown in fig. 4. O, of fig. 7, shows one of the sliding tumblers with the slot in its edge, in which the frog-bridge engters when in position to allow of same.

The operation of my look will be readily understood. By inserting the proper key G into the thin keyhole c, iig. 2, and pushing down all the sliding tumblers oo o2 o3 to their proper places and then turning the key the dog ,y will throw the frog-bridge D into the slots or recesses of the sliding tumblers o o1 o2 o3, and at the `dog y jumping oil of the nose D* of the frog-bridge; then the. arm of the cylinder C, iig. 4, holds the bolt back, and by letting the key loose the force of`spring S, iig. 3, draws the bolt and frog-bridgeand the other portions of the look back into their proper positions; as shown in fig. l.

Having now fully described my lock, what I claim as new, and desire to secure by Letters Patent, is as follows:

1. I claim the dog y on the cylinder arm of C, iig. 4, bearing on Di, shown in tig. 1, substantially in the manner and for the purpose herein set forth. A n

2. I claim the frog-bridge D, with its nose D*, as shown in g. 6, substantially 1n the manner and for the t' th. purpose herein set or EDWARD WBRETTELL.

Witnesses Ammon PUnKINsoN, EDWARD GEDDES. 

